O Oriens, splendor lucis aeternae, et sol justitiae: veni, et illumina sedentes in tenebris, et umbra mortis.
O Morning Star, splendor of eternal light and sun of righteousness: Come and enlighten those who dwell in darkness and the shadow of death.
Today is also the feast of St. Thomas the Apostle; many medieval breviaries have a special O antiphon for Vespers of his feast:
O Thoma Didyme, per Christum quem meruisti tangere, te precibus rogamus altisonis, succurre nobis miseris, ne damnemur cum impiis in adventu judicis.
O Thomas the Twin, through Christ, Whom thou didst merit to touch, with prayers resounding on high we beseech thee, come to help us in our wretchedness, lest we be damned with the wicked at the Coming of the Judge.
O Thoma Didyme, per Christum quem meruisti tangere, te precibus rogamus altisonis, succurre nobis miseris, ne damnemur cum impiis in adventu judicis.
O Thomas the Twin, through Christ, Whom thou didst merit to touch, with prayers resounding on high we beseech thee, come to help us in our wretchedness, lest we be damned with the wicked at the Coming of the Judge.